OPC UA

PHANTOM® Gateway version 2 supports OPC UA. All processed sensor data is available through it. In a repeater network, subordinate gateways forward their OPC data to the Main gateway.

No waveforms or spectra

Because of how the OPC UA protocol works, the full time waveform and the FFT are not available over OPC UA. If you need those, use MQTT with waveform publishing enabled, or one of the HTTP APIs.

Enabling it

Check the OPC UA box in the General tab of the Gateway Admin Console. The gateway then listens for TCP connections on port 4334.

Connect with any OPC UA client:

opc.tcp://192.168.1.2:4334/UA/PhantomGW

Replace 192.168.1.2 with the gateway’s IP address. Use Security Mode None and Security Policy None.

The OPC UA endpoint is unauthenticated

Security mode None means no encryption and no client authentication. Keep the gateway on a network segment where that is acceptable, and do not route port 4334 to an untrusted network.

Address space

The server is organised as a tree. Under the root there is an Objects folder, under which every sensor serial number appears. Under each serial number are the variables available for that sensor type.

Standard fields

Variable	Description
type	Sensor type
battery	Battery level in volts
batteryType	1 = 1/6D, 2 = AAA, 3 = CR2032, 4 = CR2477
temperature	Sensor internal temperature in °C
version	Firmware version

Computed metrics

The gateway calculates these for each full time waveform it receives, which is what makes OPC UA useful despite not carrying the waveform itself:

Metric	Description
ACF	Acceleration crest factor
APEAK	Maximum acceleration amplitude in the time waveform
ARMS	RMS over the whole acceleration spectrum
DCOFFSET	The acceleration constant — i.e. gravity — included in the acceleration
HIGHFREQ	Acceleration measured from 5 kHz to 10 kHz
MAX FREQ	Peak frequency in Hz
VRMS	Velocity RMS measured from 10 Hz to 1 kHz

VRMS is derived from an in-sensor calculation of the spectrum from 10 Hz to 1 kHz, which is hard-coded and cannot be changed. Its update interval is set by the Sensor Update interval in the in-sensor settings, administered from the Gateway Admin Console.

Coexistence

The OPC UA server runs at the same time as any other protocol the gateway supports, including EI Analytic, EI Monitor, MQTT and Modbus.